Pimples is a common problem at this age. Pimples occur due to blockage of oil from oil glands in the skin and it occurs under hormonal influence. Certain factors which may aggravate pimples are stress, oil based occlusive cosmetics and food items like sweets, milk and other dairy products. Pimples usually leave behind spots and chances of dark spots and scars increase if you fiddle with them. Treatment of pimples is individualised and after control of active pimples you need maintenance of the same. Please search practo for a qualified dermatologist in your area. Regards Dr Vijay Adhe Eternis Skin & Hair Clinic Pune